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Role of ultrasonic irradiation and Thiourea on the synthesis of PbS nanocrystals

V. PARASHAR1,* , S. K. PANDEY1, A. C. PANDEY1

Affiliation

  1. Nanophosphor Application Centre, Department of Physics, University of Allahabad, Allahabad-211002, India

Abstract

A novel strategy is adopted for synthesis of PbS nanocrystals via ultrasonic irradiation method underlining the effect of acoustic cavitation phenomenon on crystallinity and particle size in presence of a thiourea. X-ray diffraction (XRD) measurements have shown formation of face-centered cubic rock-salt PbS structure with enhanced crystallinity as compared to other routes. Transmission electron microscopy (TEM) images have shown particles about 5 – 15 nm range that are smaller than its Bohr Exciton radius of 18 nm. Absorption spectra have shown narrow band-edge around 275 nm that confirmed its monodispersity and blue shift in comparison to bulk PbS. Photoluminescence spectra have shown sharp emission peak at 590 nm. A probable path for its formation and chemistry is discussed to understand the mechanism of this method..

Keywords

PbS nanocrystals, Ultrasonication, Acoustic cavitation.

Submitted at: Aug. 31, 2009
Accepted at: Nov. 19, 2009

Citation

V. PARASHAR, S. K. PANDEY, A. C. PANDEY, Role of ultrasonic irradiation and Thiourea on the synthesis of PbS nanocrystals, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 11, pp. 1837-1840 (2009)